#!/bin/bash
s1_generate_a_series_of_files(){

   for i in {1..100};do echo $i>/tmp/new_file$i;done

}

s2_list_4_files_in_long_format_about_account_and_group() {

   ls -l /etc/{passwd,shadow,group,gshadow} |sort -d

}

s3_find_items_related_to_given_username() {

   grep -h $1 /etc/{passwd,shadow} |sort -d

}

s4_find_items_related_to_given_group_name(){

   grep -h $1 /etc/{group,gshadow} |sort -d

}

s5_create_groups_for_given_group_names() {

   groupadd rnd && groupadd itoperation

}

s6_create_users_and_set_their_group_as_required(){

   useradd -G rnd adam && useradd -G rnd bob && useradd -G itoperation calvin && useradd -G itoperation david && useradd -G rnd edward

}

s7_change_users_shell() {

   usermod -s /usr/bin/sh adam && usermod -s /usr/bin/sh edward

}

s8_set_password_change_policy(){

   passwd -n 10 -x 60 -w 10 adam
   passwd -n 10 -x 60 -w 10 bob
   passwd -n 10 -x 60 -w 10 david
   passwd -n 10 -x 60 -w 10 calvin
   passwd -n 10 -x 60 -w 10 edward

}

s9_set_password_for_five_users(){

   usernames=(adam bob calvin david edward)
   for i in $(seq 1 5);do echo ${!i};echo $(( $i-1 ));done
   echo "${usernames[0]}:$1" | chpasswd
   echo "${usernames[1]}:$2" | chpasswd
   echo "${usernames[2]}:$3" | chpasswd
   echo "${usernames[3]}:$4" | chpasswd
   echo "${usernames[$(( $i-1 ))]}:$5" | chpasswd

}

s10_lock_bobs_password(){

   usermod -L bob

}

s11_include_adam_into_wheel_group(){

    usermod -a -G rnd adam
    usermod -a -G wheel adam

}
s12_change_files_permission() {

    for i in {1..33};do 
    file_number=$((3*i))
    file_path="/tmp/new_file#file_number"
    if [ -f "$file_path" ]; then
    chmod -R 640 "$file_path" 
        echo "ok"
    else
        echo "no"
    fi
    done
    echo "ok"
}




















































































